The Penthouse — Characters & Cast

Securing justice for Min Seol-ah; evolves into cleansing Hera Palace of evil and protecting the surviving innocent children.

Begins as a gentle, passive penthouse queen living in ignorance of her husband’s monstrous nature. After witnessing her biological daughter's murder, she transforms into a cold, brilliant mastermind of long-term revenge. She assumes the alter-ego of Na Ae-gyo in Season 2 to dismantle her enemies from within, and ultimately chooses self-sacrifice in Season 3 after executing total retribution.

Pathological need to be #1 in music and life to gain approval, and securing absolute power for her daughter Ha Eun-byeol.

Introduced as an arrogant, ruthless prima donna who will commit any crime to stay on top. Over three seasons, her desperate drive leads her to let her own father die, sabotage rivals, commit murder, and suffer severe psychological collapse. She loses her voice, her fortune, and her daughter's affection, ending her life in prison via suicide while suffering from laryngeal cancer.

Endless financial accumulation, total dominion over Seoul real estate, and erecting 'Joo Dan-tae Village' over his childhood trauma site.

Appears in Season 1 as a refined, terrifyingly wealthy real estate mogul who controls Hera Palace. As the series progresses, his origins as a traumatized, impoverished orphan named Baek Joon-ki—who stole his dead benefactor's identity—are revealed. His sociopathy escalates to murder, terrorism, and bombing until he is shot by Su-ryeon and falls to his death as Hera Palace collapses.

Giving her daughter Bae Ro-na a life free from poverty and discrimination; evolves into genuine guilt and redemptive atonement.

Starts as an impoverished single mother working tirelessly to support her gifted daughter Bae Ro-na. Under the influence of alcohol and greed, she commits the pivotal sin of pushing Min Seol-ah off the balcony, turning her into an accidental villain. She later seeks deep redemption, alliances with Su-ryeon and Logan, but is murdered by Seo-jin in Season 3 while saving Seo-jin’s daughter.

Avenge his adopted sister Min Seol-ah and protect Shim Su-ryeon.

Min Seol-ah’s adoptive brother from the U.S. who initially poses as the eccentric physical education teacher Gu Ho-dong. He becomes Su-ryeon’s ultimate confidant, backer, and romantic interest. He survives multiple assassination attempts (including a car bomb), helps bring down Hera Palace's elite, and passes away from bone marrow cancer relapse shortly after Su-ryeon's death.